Molecular pi vot-balance



(No Model.) 2 Sheets-Sheet 1.

A. SPRINGER. I

MOLECULAR PIVOT BALANCE.

No, 340,012. Patented Apr. l3, 1886.

W] T NESSES 1N VEN T OR CM if I: a? I T ATTORNEY (No Model.) 2 Sheets-Sheet 2.

A. SPRINGER. i

MOLECULAR PIVOT BALANCE. No. 340,012. Patented Apr. 13, 1886.

WITNESSES: 1N VEN T OR QXX A, S\armc w ATTORNEY n Pnzn. rum- Wm ac,

UNITED STATES PATENT Orrice.

ALFRED SPRINGER, OF CINCINNATI, OHIO.

MOLECULAR PIVOT-BALANCE.

Application tiled June 12, lSrS.

To all whom, it n'my concern:

Be it known that I, ALFRED SPRINGER, a citizen of the United States, residing at Cincinnati, Ohio, have invented new and usct'ul Improvements in Molecular Pivot-Balances, of which the following is a specification.

My invention relates to molecular pivot-bat ances, its object being to produce in compact, convenient, and economical form a practicable weighing-balance adapted to ordinary commercial uses; and it consists in the construction of a molecular pivot-balance, as hereinatter pointed out and illustrated in the drawings, in which Figure l is a perspective viewot' atorsioual pivot-balance embodying myinvention. Fig.

2 is a side elevation of the same; Fig. 3. a per-' spective View of a torsional balance slightly differing in form, but embodying the same principles, and Fig. 4 a side elevation of a flexioubalance eu'ibodying the same principles of construction.

My present invention is the outgrowth of the fact that in all molecular pivotimlances wherein a counterpoise is employed to counterbalance the molecular resistance of the piw ots the di'lficulty of maintaining the true horizontal position of the scale structure is a serious impediment to the ordinary and practical use of such balances.

Myinvention is designed to embody a principle of construction by which this ditliculty is overcome, and certain other advantages relating to compactness, cheapuess, and utility also obtained.

To this end it consists in a weighingbalance embodying two oscillating beams,'whose proximate ends, provided with elastic pivots, oscillate iii-opposite arcs in a common vertical plane, said beams having independent fulcra at different elevations and respectively below the centers of gravity of the beams, and a rigid connection between such elastic pivots,

carrying the weight-receptacle.

Referring now to the drawings, A designates the scale-beam; B, the scale-pan; S, the main supportingstandard; C, the auxiliary poise; s, the standard upon which said poise is supported; D, the auxiliary beam or lever-arm, to which said standard .9 is rigidly attached, and E a rigid connection between the terminal "ICAT ON forming part of Letters Patent No. 340,012, dated April 13, 1886.

Serial X0. 16*, 1.30. (No model.)

pivotp ot the beam Aand the terminal pivot p of the auxiliary arm D.

In the construction shown in Figs. 1 and 2 of the drawings, I have shown the torsionframe heretofore described in patents granted to the late Dr. F. A. Roeder and myself. consisting. essentially, of a system of diagonal braces, around which the torsional pivot, consisting ot a wireor band of metal, is stretched. In said figures one of such frames, G, constructed double, is attached to and supported in an inclined position, as shown, upon the main supporting-standard S and smaller supports a a, both upon the base-frame H. A single wire or band being stretched around said frame, or upon a boxing int-losing the lower working parts, its upper horizontal por tion constitutes the fulcrum-pivot p for the beam A, while its lower horizontal portion constitutes the fulcrum-pivot p of the auxiliary beam or lever arm D. In this case the rigid connection E is also one of such torsit'nrt'rames, which has a single wire or band stretched upon it, the upper horizontal portion constituting the terminal pivot f of the scale-beam A, and its lower horizontal portion constituting the terminal pivot 12 ot' the an iliary beam or lever D. The torsiol'i-i'rame E is made small enough to play inside of the torsion-frameG, and the scale-pan Bis rigidly connected with the torsion i'rame' E by the standard 7), rising therefrom and bifurcated to permit the passage and play of the forward extension of the scalebcam, which in this case is carried forward and passed through a suitable yoke, I, to limit the oscillations of the beam. Incidentally said yoke serves as a protection to the other parts from injury. The auxiliary beam or lever-arm D and its stand ard s constitutes, in effect, a bell-crank lever, as will be seen, the horizontalportion of which performs the function of a radius-arm to preserve the perpendicularity ot' the scalepan support.

In the cases illustrated in the present drawings the fulcrum-connection ot' the beam is below the longitudinal axis of the beam. The beam, therefore, is its own counterpoise as against molecular resistance of the pivots. It is found desirable, also, that the terminal pivot 19* of the beam should be arranged in a lower plane than the fulcrum-pivot 1). As thus constructed, it will be seen more clearly ,by reference to Fig. 2, that if the scale structure rests upon an uneven basis, the statical 5 moment of the beam counterpoise is counteracted by the statical moment of the auxiliary poise C, so that in whatever position'the scale is placed its beam action remains unimpaired.

The structure show min Fig. 3,while differing slightly in form, involves no change in principle of construction. In such case the two torsion-frames are arranged horizontally, the upper one, G, being attached toand constituting part of the beam A, one of its wires I or hands constituting the fulcrum-pivot p of the beam, the other the terminal pivotp' of the beam. The lower torsion-frame, E, constitutes the auxiliary beam or lever. (Marked D in Figs. 1, 2, and 4.) It carries the stand ard S and the auxiliary poise O and performs all the functions of the auxiliary beam or le ver D. In this case the standard b. supporting the scalepan B, is extended downward and forms a rigid connection between the pivots andp the pi rot 19 being rigidly secured to asupplemental standard, S, rising fromthe base H. In short,the changes of structure are only such as result from attaching the pivots directly to the beam instead of to separate tor- 3 sio n-frames, as in Figs. 1 and 2, this change being already fully described in pending applications for Letters Patent. v Fig. 4 exhibits the same structure as shown in Fig. 3, excepting the substitution of "flexion-pivotsfortorsion-pivots. In thiscasc the fiexion-pivots, consisting of thin metal plates, are preferably disposed vertically in a plane transverse to the longitudinal axis ofthe beam. The connection or fastening of said 4 plates to the parts is made by inserting the same in suitable slits formed therein and clamping by set screws e.

The description heretofore given of the relative arrangement of the parts applies,and to avoid unnecessary repetition is not given here.

\ In all these cases it will be seen that the action of weight upon the scale-pan is transmitted to the standard b and pulls downward upon the pivot 19". The auxiliary beam or lever D being depressed, the poise!) is thrown to the left, and its statical moment opposes the molecular resistance of the pivots as does also the center of mass of the beam. The sliding weight 10 may be used or asuspended weightpan, as in other cases, to indicate the mass weighed.

I claim as my invention and desire to secure by Letters Patent of the United'St-ates- 1. In a weigliingbalance, the combination of two beams havingindependent fulcra below their respective centers of gravity, and arranged in a common vertical plane at dif- 'ferent elevations; so that theirproximate ends oscillate in opposite vertical arcs, in combination with elastic pivots secured to the said proximate beam ends, and a rigid connection between said pivots carrying the weight-platform, substantially as set forth.

2. In a molecular pivot weighing-balance, the combination of a steelyard balance-beam fulcrumed below its center ofgravi-ty,a radiusarm fulcrumed below and in the vertical plane of the balance-beam in such relation that it oscillates in an are opposite to that of the pivot end of the balance beam, an oscillating poise-weight carried by said radius-arm vertically above its fulcrum, and a pan-support rigidly connecting the terminal pivots of the radius-arm and balance-beam, substantially as set forth.

3. The combination, in a weighing-balance, of a weight-beam, A, auxiliary beam D, elastic pivots 1) p 1)" 1)", rigid connecting-link b, a weight-pan, standard S, and weight 0, arranged and operating substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscrib ng witnesses.

ALFRED SPRINGER.

Witnesses:

L. M. Hosm, ABRAM MAY. 

